#include <stdio.h>#include <stdlib.h>#include <time.h>#include <string.h>#include <dirent.h>#include <sys/stat.h>#include <pwd.h>#include <grp.h>#define NAME_SIZE 128struct filename{ //定义一个结构体，用于存储文件名称 char name[NAME_SIZE];};void output_info(struct filename *head); //输出所有信息void output_mode(mode_t mode); //输出文件权限信息void output_user_group(uid_t uid,gid_t gid); //输出文件所属用户名和组名void output_mytime(time_t mytime ); //输出文件最后一次被修改的时间int main(int argc,char *argv[]){ if(argc < 2) //判断参数个数，少于两个参数报错 { fprintf(stderr,"usage:%s <pathname>",argv[0]); exit(EXIT_FAILURE); } int i; for(i = 1;i < argc;i ++) //分别对每一个参数的文件属性进行判断 { struct stat stat_info; //文件属性 if(stat(argv[i],&stat_info) == -1) { printf("%s is wrong\n",argv[i] ); //参数有错误，报错，判断下一个参数属性 continue; } if(S_ISREG(stat_info.st_mode)) //文件属性是文件类型 { struct filename *temp = malloc(sizeof(struct filename)); //申明一个指针，给他分配一个struct filename大小的空间 if(temp == NULL) { perror("malloc in regular file"); exit(EXIT_FAILURE); } memset(temp->name,'\0',NAME_SIZE); //初始化 memcpy(temp->name,argv[i],strlen(argv[i])); //将参数名称拷贝到name中 output_info(temp); //输出文件信息 free(temp); } else if(S_ISDIR(stat_info.st_mode)) //文件属性是文件夹 { DIR *dirp = NULL; if((dirp = opendir(argv[i])) == NULL) //打开文件夹 { perror("opendir"); exit(EXIT_FAILURE); } struct dirent *entp; while((entp = readdir(dirp)) != NULL) //依次读取文件夹内部的文件 { if(strcmp(entp->d_name,".") == 0 || strcmp(entp->d_name,"..") == 0) //如果是“.”和“..”文件，跳过 continue; struct filename *temp = malloc(sizeof(struct filename)); if(temp == NULL) { perror("malloc in directory"); exit(EXIT_FAILURE); } char *name_dir = malloc(strlen(argv[i]) + 1 + strlen(entp->d_name) + 1); sprintf(name_dir,"%s/%s\0",argv[i],entp->d_name); //将文件夹内文件的路径保存在name_dir中 memset(temp->name,'\0',NAME_SIZE); memcpy(temp->name,name_dir,strlen(argv[i]) + 1 + strlen(entp->d_name) + 1); output_info(temp); free(temp); free(name_dir); } } } return 0;}void output_info(struct filename *temp){ struct stat mystat; if(stat(temp->name,&mystat) == -1) { perror("mystat temp->name"); exit(EXIT_FAILURE); } output_mode(mystat.st_mode); printf(" %ld",mystat.st_nlink); output_user_group(mystat.st_uid,mystat.st_gid); printf(" %ld",mystat.st_size ); output_mytime(mystat.st_mtime); printf(" %s\n",temp->name );}void output_mode(mode_t mode) { char type[7] = {'p','c','d','b','-','l','s'}; int index = (mode >>12 & 0xF) / 2; printf("%c",type[index] ); char *perm[8] = {"---","--x","-w-","-wx","r--","r-x","rw-","rwx"}; //按照000，001，010，011...111排列 printf("%s",perm[mode >> 6 & 07] ); //root用户权限 printf("%s",perm[mode >> 3 & 07] ); //组用户权限 printf("%s",perm[mode >> 0 & 07] ); //其他用户权限}void output_user_group(uid_t uid,gid_t gid){ struct passwd *user; user = getpwuid(uid); //通过用户ID查看用户信息 printf(" %s",user->pw_name ); //打印用户名信息 struct group *group; group = getgrgid(gid); //通过组ID查看用户信息 printf(" %s",group->gr_name ); //打印组名信息}void output_mytime(time_t mytime ){ char buf[128]; memset(buf,'\0',sizeof(buf)); memcpy(buf,ctime(&mytime),strlen(ctime(&mytime)) -1); //打印文件最后一次被修改的时间，保存在buf中，ctime将时间转换为字符串形式 printf(" %s",buf );}
